Observer variability in posture assessment from video recordings : the effect of partly visible periods
2017 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 60, 275-281 p.Article in journal (Refereed) Epub ahead of print
Observers rank partly visible postures on video frames differently than fully visible postures, but it’s not clear if this is due to differences in observer perception. This study investigated the effect of posture visibility on between-observer variability in assessments of trunk and arm posture. Trained observers assessed trunk and arm postures from video recordings of 84 pulp mill shifts using a work sampling approach; postures were also categorized as ‘fully’ or ‘partly’ visible. Between-worker, between-day, and between-observer variance components and corresponding confidence intervals were calculated. Although no consistent gradient was seen for the right upper arm, trunk posture showed smaller between-observer variance when all observers rated a posture as fully visible. This suggests that, partly- visible data, especially when observers disagree as to the level of visibility, introduces more between-observer variability when compared to fully visible data. Some previously-identified differences in daily posture summaries may be related to this phenomenon.
Place, publisher, year, edition, pages
2017. Vol. 60, 275-281 p.
Observation, inter-rater agreement, posture, exposure assessment, pulp mill
Environmental Health and Occupational Health
IdentifiersURN: urn:nbn:se:hig:diva-21286DOI: 10.1016/j.apergo.2016.12.009OAI: oai:DiVA.org:hig-21286DiVA: diva2:907860
FunderForte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761